This article is based on a Ph.D. dissertation completed under the direction of Dr. George A. Kopp. The research was supported, in part, by a grant from the Office of Vocational Rehabilitation, Department of Health, Education, and Welfare.

This article is based on a Ph.D. dissertation completed under the direction of Dr. George A. Kopp. The research was supported, in part, by a grant from the Office of Vocational Rehabilitation, Department of Health, Education, and Welfare.×